WP_Customize_Setting::get_root_value( mixed $default_value = null ): mixed

Source

protected function get_root_value( $default_value = null ) {
	$id_base = $this->id_data['base'];
	if ( 'option' === $this->type ) {
		return get_option( $id_base, $default_value );
	} elseif ( 'theme_mod' === $this->type ) {
		return get_theme_mod( $id_base, $default_value );
	} else {
		/*
		 * Any WP_Customize_Setting subclass implementing aggregate multidimensional
		 * will need to override this method to obtain the data from the appropriate
		 * location.
		 */
		return $default_value;
	}
}

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